What does Mt.24:35 mean?

What does Jesus mean when he says that heaven and earth will pass away. Is heaven eternal?

According to the Navarre Bible commentary on the Gospel of Matthew, “This is further confirmation that the prophecies he has just made will be fulfilled; it is as if he were saying: it is easier for heaven and earth, which seem so stable, to disappear, than for my words not to come true…”

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